ICD10BillableValid for clinical use
ICD-10 Code E73.9: Lactose intolerance, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Endocrine, nutritional and metabolic diseases (E00-E89).
When is it used?
- May be used when a clinician documents lactose intolerance, unspecified in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
4Endocrine, nutritional and metabolic diseases (E00-E89)
block
E70-E88Metabolic disorders
category
E73Lactose intolerance
currentE73
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
EndocrinologistGeneral Physician
Related codes
Sibling codes
Mapped diagnoses and classifications
SNOMED_CT 22169002high
Intestinal disaccharidase deficiency
Source: SNOMED International ICD-10 map
SNOMED_CT 782415009high
Intolerance to lactose
Source: SNOMED International ICD-10 map
SNOMED_CT 54250004high
Intolerance to lactose in children without lactase deficiency
Source: SNOMED International ICD-10 map
SNOMED_CT 785696007high
Malabsorption syndrome due to intolerance to lactose
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
E73.9
Common synonyms
Lactose intolerance, unspecifiedLactose intolerance
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.